package com.acxiom.bsh.util;

import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;

import org.apache.commons.codec.binary.Base64;

import com.acxiom.bsh.constants.CommonConstant;

public class CryptUtils {

	// 加密
	public static String encrypt(String input, String key) {
		if (key == null) {
			return null;
		}
		// 判断Key是否为16位
		if (key.length() != 16) {
			return null;
		}
		try {
			byte[] raw = key.getBytes("utf-8");
			SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
			Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");// "算法/模式/补码方式"
			cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
			byte[] encrypted = cipher.doFinal(input.getBytes("utf-8"));
			return new Base64().encodeToString(encrypted);// 此处使用BASE64做转码功能，同时能起到2次加密的作用。
		} catch (Exception e) {
			return null;
		}

	}

	// 解密
	public static String decrypt(String src, String key) {
		try {
			// 判断Key是否正确
			if (key == null) {
				return null;
			}
			// 判断Key是否为16位
			if (key.length() != 16) {
				return null;
			}
			byte[] raw = key.getBytes("utf-8");
			SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
			Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
			cipher.init(Cipher.DECRYPT_MODE, skeySpec);
			byte[] encrypted1 = new Base64().decode(src);// 先用base64解密
			try {
				byte[] original = cipher.doFinal(encrypted1);
				String originalString = new String(original, "utf-8");
				return originalString;
			} catch (Exception e) {
				return null;
			}
		} catch (Exception ex) {
			return null;
		}
	}
}
